Mitsubishi Electric MELSEC iQ-R Series User Manual page 37

Logging device values before and after the rise of a trigger condition
The device values before and after the rise of a trigger condition for the number of specified logging lines are logged.
Only device values can be output. The number of times the counting condition has held true and the time when the counting
condition has held true cannot be output.
There are two methods for specifying the number of logging lines.
■Logging device values before and after the rise of a trigger condition
Specify the number of lines before and after the rise of a trigger condition.
Device value
Lines before rise
The device values before and after the specified lines are output based on the rise of a trigger.
■Logging data before the rise of a trigger condition, while a trigger condition is satisfied, and
after the fall of a trigger condition
Specify the number of lines before the rise of a trigger, the number of lines after the fall of a trigger, and the total number of
lines.
The total number of lines indicates the maximum number of lines that can log data with a single trigger rise.
Set the value more than the total number of lines before the rise of a trigger and after the fall of a trigger.
The lines exceeding the total number of lines before the rise of a trigger and after the fall of a trigger are assigned to the
logging lines on which the trigger condition is satisfied.
It can be specified in the case of the following settings.
• When "Single condition" is selected in the trigger setting, and "Comparison" is selected in the data condition.
• When "Compound condition" is selected in the trigger setting, and "AND combine" is selected in the trigger type.
With this setting, the logging range differs according to the length of time the trigger condition is satisfied.
● The time that the trigger condition is satisfied is short.
The total number of lines before and after the rise of the specified trigger condition and while the trigger condition is satisfied
are logged.
Device value
Lines before rise
Trigger rise
Lines after rise
Trigger rise Trigger fall Trigger fall Trigger fall
Lines after rise Lines after rise Lines after rise
Total number of lines
Number of logging lines
Time
Time
1 FUNCTION
1.1 Data Logging Function
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